The Megger 550503 is a three-phase transformer turns ratio (TTR) test set. The 550503 Three-Phase Automatic TTR is designed to measure the turn ratio of power, instrument, and distribution transformers in a substation or manufacturing environment. The Megger 550503 is also particularly suited for testing in power transformer manufacturing environments where testing of complex, three-phase substation power transformers can be performed quickly while minimizing the possibility of errors. Key features of the Megger 550503:

• Fully automatic operation
• Measures three phases simultaneously
• High ratio measurement (20,000:1)
• High accuracy (0.1%)
• Built-in storage and downloading capabilities
• Measures all power transformers, PT’s and CT’s
• Displays % error vs. nameplate and pass/fail limit